Draw works



June 6, 1939. J. s. MORGAN, JR 2,161,075

' DRAW WORKS Filed Dec. 21, 1935 '7 Sheets-Sheet l June 6, 1939.

Filed Dec. 21, 1935 J. S. MORGAN. JR

DRAW WORKS 7 Sheets-Shet 2 w -mww Gum mp June 6, 1939. .1, s. MORGAN, JR

DRAW WORKS Filed Dec. 21, 1935 7 Sheets-Sheet" s II A.

u 39- ,1'. s. MORGAN. JR

DRAW WORKS Filed Dec. 7 Sheets-Sheet -4 June 6, 1939. J. s. MORGAN, JR

DRAW WORKS Filed Dec. 21; 1935 7 Sheets Sheet 5 June 6, 1939 I J N, JR 2,16L075 DRAW WORKS Filed Dec. 21, 1935 7 sheets-shet e June 6,

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Patented June 6, 1939 UNITED s'm'r zs PATENT: OFFICE bymesne Company, Pittsburgh, Pa., a corporation Pennsylvania cuts, to The National Supply Application December :1, 1935, Serial No. 55.591

Claims. (01. 255-19) This invention relates to a rotary drawworks applicable for use in connection with drilling equipment as utilized in drilling for 'water, oil, or gas, and more-particularly to the type of 5 rotary drawworks employed in connection with the rotary method of drilling.

This invention is directed to an improved rotary drawworks wherein a power transmission means is employed through the medium of which '10 itispossibletoobtainamaximumnumberof speeds of rotation of the drum shaft while using a minimum number of transmission connections. It is an object of this invention to provide an improved form of rotary drawworks wherein the 1 drum shaft of the rotary drawworks may be driven at a maximum number of speeds from a power shaft through a minimum number of transmission connecfions.

Another object of this invention is to provide a rotary drawworks for use in connection with the rotary method of drilling wells, which includes a pair of shafts having power transmission connections between them and through which power transmission connections a maximmn number of speeds may be transmitted from one shaft to the other.

Other objects and advantages of this invention it is believed will be apparent from the herein after contained description of the preferred eni-. bodiments of my invention. 3 Y

works illustrating the brake and clutch operating levers. Figure 5 is a fragmental planview of the rotary drawworks embodying my invention.

Figure 6 is a fragmentai sectional view taken substantiallyonthelineG-iofFlgure-iofthe drive shaft assembly of the rotary drawworks embodying my invention.

Figure'iisafragmentalsectional viewtaken substantiallyonthelinel1ofFigure6further 5oillustratingthedriveshaftassembly Figureiiisasectimalplanviewofthedrawworks illustrating the clutch operating foot levers.

l 'igureiiis'aplanviewofamodifled formof drawworks embodying my invention and shown partlyincromsection.

side elevation partly in section Figure 10 is a diagrammatic view illustrating a further modification of the drawworks embodying my invention illustrated in connection with an improved drilling control.

figure 11 is a partly sectioned view of the rotary drawworks drive shaft as illustrated in Figure 10.

Figure 12 is an end sectional view taken substantially on the line l2-l2 of Figure 9.

In the rotary drawworks embodying my invention as shown by the form illustrated in Figures 1 to 8, inclusive, there is included a drum shaft, I, a drive shaft 2, and a cat shaft 3. The shafts I, 2 and 3 are rotatably supported in bearings carried by end frames 4. V

Mounteduponthedrumshaft l isadrumi which is provided at one end with brake rims 6 over which brake bands I are trained. Any suitable or desirable, meansmay be employed for tightening the brake bands I upon the brake rims 6, one form of which is illustrated in Figure 2.

Transmission drive connections are provided for drivingthe drum shaft I from the driveshaft 2, which transmission drive connections preferably include sprockets l, 9, III, II, l2, l3, ll and it. These sprockets are mounted upon the drum shaft l and drive shaft 2 in position so that the transmission connecting members such as chains, indicated in dotted lines at I6, are trained over the respective pairs of sprockets. The sprockets as thus described are all journaled upon the shafts I and 3, and clutch means consisting of clutches l1, l8, I9, 20, II and 22, are provided for releasablv clutching the sprockets to the respective shafts. The sprockets II and it are both mounted "upon asleeveii so these sprockets will rotate together. Sprockets"! and ii are likewise mounted upon a common sleeve '24. The driving connections as thus provided from the drive shaft F and drum shaft l are: ahigh speed direct transmissionconnection as pro-- vided from the shaft -2 tiithe shaft I when the clutches 2| and 22 are engaged, and when no other clutches are engaged, provide a high speed connection wherein only a single driving chain is caused to move. The transmission connection provided between sprockets 8,8, III, II, II and ",providesameans driveofthedrumshaitlfromthediiveshaftlli 3 while utilizing a minimum number of drive connections.

The four speeds of drive thus transmitted from the drive shaft 3 to the drum shaft I are:

One speed is attained by the actuating of clutches I1 and I8 so that a drive is had from the shaft 2-to the shaft I through the sprockets 9 and 8 and connecting transm' ion chain I6.

A second speed of drive is had when clutches I9 and 20 are actuated to give a drive from the sprocket I3 through the connecting chains I6 to the'drlven sprocket I2 and shaft I.

A third speed of drive is had when the clutches I8 and 20 are actuated so that the drive is from sprocket II through the chain I5 to the sprocket I and drumshaft I. r

A fourth speed of drive is had when the clutches I9 and I1 are engaged, at which time the drive is from the shaft 3 through the sprocket I3, chain I6, sprocket I 2; from the sprocket I ll through chain I6 to the sprocket II, and from the sprocket through the chain IE to the sprock- Means are provided for driving the cat-shaft 3 froni the drive shaft 2, which means preferably includes a cat shaft drive sprocket 25 journaled on the drive shaft 2 and adapted to be releasably connected thereto by means of a cat shaft clutch 26. The cat shaft driven sprocket 21 is secured to the cat shaft 3 and is connected with the driven sprocket 25 by means of a chain diagrammatically illustrated at 23.

Means are provided for driving a rotary machine (not shown) from the drive shaft 2, which means preferably includes a rotary drive sprocket 29 which is journaled upon the shaft 2 and is adapted to be releasably coupled thereto by means of a rotary drive sprocket clutch 30. A double sprocket 3| is journaled upon the drum shaft I and includes sprocket teeth 32 and 33. A chain diagrammatically illustrated at 34 connects the sprocket 29 with the double sprocket 3I, and a chain extends-from the teeth 33 of the double sprocket 3 I forwardly to drive the'rotary ma-- chine drive sprocket (not shown).

Means are provided -for actuating the respective clutches, which means are preferably all located at the position assumed by the driller in controlling the rotary drilling apparatus. A clutch lever 35 is provided for actuating the clutches I8 and I9. The cl'utch lever 35 is pivotally supported upon the end frame and is connected through a series of links 36 (Figure 4) to a shaft 3'! supported by the end frame in brackets 38. Shaft 31 is connected through a crank 39 with a pair of clutch shifter rods 40 and M, which in turn are connected to the clutch shifter forks 42 and 43. Actuation of the clutch shifter lever 35 to the right, as viewed in Figure 4, causes engagement of the clutch I8, and actuation of this lever in the opposite direction causes disengagement of the clutch I8 and engagement of the clutch I9.

Clutch pedals 44, 45 and 46 are positioned at the drillers position for engaging the clutches,

nected to the clutch shifter fork 5s. The clutch shifter fork 56 actuates the clutch shifter collar 5I. The clutch collar 51 is connected by rods 58 to the shifting clutch jaw 59 which is splined upon the drum shaft I. The rods '58 extend through the interior of the drum 5 which is splined on the drum shaft I and the collar 51 is mounted within the space surrounded by the brake rims 6 in order that the space between the end frames 4 of the drawworks may be decreased.

The direct drive pedal 46 is secured to a shaft brake bands l through a lever and link system which is, as illustrated, of the type'described in Patent No. 1,956,433 issued to Forrest J. Young, et al..

' position to enable the driller to operate the two The cat shaft pedal 61 is secured to a shaft 68 supported by brackets 69, and. an actuating rod III is connected through a suitable lever with the shaft 68 and is likewise connected by a suitable lever with a shaft II. An operating rod 12 connects the opposite end of the shaft II with the shifter yoke I3 for shifting the cat shaft clutch 26.

A rotary clutch pedal 14 is secured to a sleeve 15 journaled on the shaft 68 and is connected through suitable levers and the rod 16 with the sleeve 54 journaled upon the shaft II and through suitable levers and operating rod 18 with the rotary drive sprocket shifter fork 19 for actuating the rotary drive sprocket clutch 30.

Mounted at any suitable point upon the drive shaft 2 is a power sprocket 8|] which is connected through the use of a suitable transmission element with any desired form of prime mover.

Means are provided for lubricating the transmission drives, and this means preferably includes a means of providing a continuous circulation of lubrication medium to the different transmission elements and in the preferred form illustrated in the drawings includes a gear type oil pump 60 which is driven through suitable transmission connections 8| from the drive shaft 2. The pump 60 is mounted in a sump 82 formed in the enclosing means by which the transmission elements of the rotary drawworks embodying my invention are preferably enclosed.

Conduits 83 extend from the gear pump 60 to deliver lubricant from the sump B2directly-over each of the transmission elements. In order to maintain the transmission elements free of foreign matter, dirt, or the like, and to confine the circulated lubricant, housings 84 of any suitable form are provided for enclosing the transmission elements and are so positioned as to permit the lubricant delivered from the pump 60 to the transmission elements located within the housings to be conducted back to the sump 82 so as to permit a continuous circulation of transmission lubricant. v

A filling opening 85 is provided in the case forming the sump 82 to permit filling of the case to the desired level with lubricant.

In the modified form of construction embody-' ing my invention illustrated by Figures 9 and 12, similar parts are numbered with similar numbers with the addition of an exponent "a" thereto, and in this form of construction the principal 5 differences are found in the fact that the drum 5 mounted upon the drum shaft I is of customary construction in that it includes brake rims'i formed at its opposed ends. In this form of construction there. is illustrated no cat shaft 1 in the particular illustration given, but it is obvious that the cat'shaft could be provided and mounted substantially as shown in connection with the modifications illustrated in Figures 1 to 8, inclusive, if desired.

The transmission connections are similar to that as heretofore described in connection with the first form set forth in that four speeds of drive of the drum shaft l',are had from the drive shaft 2* through the use of three complementary pairsof drive and driven elements, the construction and location of which elements differ from that as heretofore described in connection with the first form of my invention.

In the form as illustrated in Figure 9, a sleeve 86 is journaled upon the shaft 2. A sprocket 5, corresponding to the sprocket is secured to one end of the sleeve, and a sprocket ll, similar to the sprocket ll, is secured to the opposite end of the sleeve. 'A sprocket I3 is journaled on the shaft-l The drive sprocket 80' is secured directly to shaft 2 at one end thereof. An auxiliary sprocket 81 is likewise securedto the sleeve 86 and may be used as a rat-hole" sprocket or may be usedto drive a cat shaft or other auxiliary units employed in the rotary process of drilling wells. Sprockets I", II and I:- are journaled upon the drum shaft l'. The sprockets II and 1 I! are both formed upon the same sleeve so that they are dependently rotatable.

Clutches l1, It, I! and 20'- are provided for releasably clutching transmission units to the respective shafts in order to provide for the transmission drives between the shafts; The high speed drive is accomplished by engaging the 45 clutches II, and 20' when the drive from the shaft 2 to the shaft l is from the sprocket k to the sprocket II. The second highest-speed of drive is accomplished by the clutch I! and the clutch II, The drive established is 50 then through sprocket I! to sprocket l2 and shaft I. The next lowest speed is established by engaging the clutch ll and the clutch II. The drive is then through the sprocket l to the sprocket 8' direct to the drum 5. The lowest 55 speed, or the fourth speed provided through the novel transmission arrangement embodied in my invention is provided when the clutches I! and the clutches I'l .are engaged. When thus engaged the drive is through the sprocket It to the 60 sprocket I!- back through the sprocket II- to.

the sprocket II and then through the sprocket 9? to the sprocket I and directly to the drum 5'. The rotary drive sprocket 29' is journaled on the shaft 2 and is. adapted to be releasably 05 clutched to the shaft 2" through the ,clutch face 3| of the double clutch It. The double sprocket 3| is journaled upon the drum shaft I".

In order to-provide for a two-speed drive of the rotary machine through the transmission 7 connections provided, clutch teeth I! are formed at the end of the sleeve supporting the sprockets II and Il and a clutch collar 89' is splined upon a, sleeve extension 80 of the double sprocket 3|. The two-speed drive for the rotary ma- 75 chine is provided by the following connections:

7 3 The highest speed by the double clutch ll to the positiom where the clutch face 30 engages the clutch face of the sprocket 29. The drive then from the sprocket 29 to the smaller sprocket of the double sprocket 3| and through the double sprocket to the rotary machine (not shown).

The second, or lower, speed drive to the rotary machine is provided by throwing the clutch Hi to the position where sprocket I3 is clutched to the shaft 2 and by en aging the clutch 88"- with the clutch face 88' so that the drive of the sprocket l2 and the sprocket I 3* is transmitted to the double sprocket 3i and hence to the rotary ma chine.

A third feature of the ,modified form of my invention resides in the invention of the clutch II by means of which. sprocket 8 is clutched directly to the drum 5. f

In this construction it would be inadvisable to weaken the shaft I by forming a keyway therein at the point where the sprocket 8 is mounted as this is the point of greatest stress upshifting collar 95 is journaled on the. shaft i=- and is connected to the clutch jaw 9| by means of studs 96. Any suitable or desirable form of clutch shifter means are provided in conjunctionwith each of the clutches as herein set forth in this modified form and may be similar to that set forth in connection with the clutch actuating means provided in the first form of my invention above described;

Afurth'er modified form of my invention is illustrated in Figures 10 and 11. This modified form of my invention diifers from the first form described principally in the particular details as will hereinafter be pointed'out, and similar parts in this modification are numbered with the same numbers with the addition of an exponent "b" thereto.

In the diagrammatic illustration of Figure 1 the rotary machine which is driven from the double rotary drive sprocket 3| is illustrated at 91". In this construction a rotatably mounted drive sleeve 88" is journaled upon a sleeve ex tension of the sprocket [3 and a clutch 99 is provided for releasably clutching the sprocket 99 to the sprocket l8". 1 The drive sprocket 80 is moved to the outward end of the shaft 2 and the .clutch 22'- provides the means for releasably With this rearrangement of the construction there is incorporated in the drawworks a feeding control which employs a variable speed hydraulic transmission for accurately governing the rate of feed of the drill pipe in the hole during the drilling operations. The feed control alsoincludes one ormore speed reduction units 100 which are unit I03 of the Waterbury gear is connected through suitable conduits I08 with the pump unit I04".

As is customarily provided in such hydraulic gear drivesof the Waterbury pump type, a control screw I09 is provided upon the pump end to vary the rate of discharge of oil to the motor end. The motor end is essentially a constant stroke motor and its speed is accurately governed by the rate of flow of oil delivered to it. Therefore, the setting of the control screw Hi9 governs the speed of the shaft Hi2 assuming that the shaft 2* rotates at a constant speed.

With the clutches Ill'l and 99 engaged as the rotary drill pipe is lowered into the hole through the reeling out of the cable upon the drum 5 the speed of drop of the drill pipe-is controlled. Assuming that the shaft 2 is rotated at a constant speed through the drive sprocket 80 and 'fore the speed at which the drill pipe is lowered into the hole is accurately controlled.

During this operation it possible to use the 1. In a rotary drawworks, the combination of a drive shaft, a driven shaft, means for driving the drive shaft, a rotary drive sprocketmounted on the drive shaft, a double rotary drive sprocket reduction available in'the drawworks itself because the sprockets 9*, II and [3 and the clutch 99 float on the drive shaft 2 and are not affected by its rotation which is necessary to drive the rotary machine 97'. It will be obvious that the drilling control thus provided can be easily disconnected at will from the drilling apparatus simply by disengagingthe clutches I01? and 99 and when thus disconnected the drawworks can be operated in the conventional manner.

The feed control thus described may be utilized as a transmission connection through which the drum of the drawworks may be rotated in a direction to raise or lower the tool suspendedfrom the line wound upon the drum, or may be utilized to hold the same in position.

With the modified form of drawworks, including the hydraulic feed control, when desired the full power of the transmission drive to the draw- .,works drum and the rotary machine may be had without driving through the feed control.

' In the construction of drawworks illustrated in Figure 3, the end frames are formed in sections with the upper section bolted to the lower section, permitting removal of the upper section without disturbing the drive shaft 2 or the cat shaft 3, or the clutch operating mechanism. Thus it is possible, by removing these frame sections and supporting the drum upon blocks, or in any other manner, to remove and replace the brake rim 6 assembly without dismantling the drum shaft l or removing the drum shaft from the drawworks.

' In this form of drawworks it is also apparent that a high speed direct drive is provided with Having fully described my invention, it. is to on the driven shaft, means for releasably engaging the rotary drive sprocket with the drive shaft, a transmission connection'from the rotary drive sprocket to one sprocket of the double sprocket, a transmission element onthe driven shaft, means for directly coupling the transmis- 'sion element to the double sprocket, and a releasable transmission drive from the drive shaft to said transmission element to drivethe double rotary sprocket at a second speed 2. In a rotary drawworks, the combination of a drive shaft, a drum shaft, a drum mounted thereon, a single sprocket rotatably mounted on I each shaft, a double sprocket rotatably mounted on each shaft and positioned immediately adjacent the single sprocket, one sprocket of each double sprocket being mutually aligned, the other sprocket of each double sprocket being aligned with one of said single sprockets, transmission connections between each pair of aligned sprockets, a pair of spaced clutches splined on a each shaft with a single sprocket and a double sprocket interposed between them, separate actuating means to selectively engage each respective clutch, one of said means including an element slidably mounted on the drum shaft, said drum being interposed between said element and its respective clutch.

3. In a rotary drawworks, the combination I of a drive shaft having a rotary machine drive sprocket mounted thereon, means to drive the drive shaft, a drum shaft parallelto the drive shaft and having a spoofing drum mounted thereon, a pair of sprocket members rotatably mounted on the drum shaft with said drum'interposed between them, a sleeve rotatably mounted on the drive shaft and extending laterally beyond both ends of said drum, a pair of sprockets fixed upon said sleeve in spaced'relation and each aligned with one of said drum -shaft sprocket members, transmission connections between each pair of aligned sprockets, selective clutch means whereby either of said drum shaft sprocket members may drive said drum, additional-clutch means adapted to selectively engage said sleeve with said drive shaft, said drive shaft being adapted to drive the rotary-machine drive sprocket independently of the drum, upon disengagement of the last mentioned clutch means.

4. In a. rotary drawworks, the combination of a drive shaft having a rotary machine drive sprocket mounted thereon, means to drive the drive shaft, a drum shaft parallel to the drive shaft and having a spooling drum mounited thereon, a pair of sprocket members rotatably mounted on the drum shaft withsaid drum interposed between them, a sleeve rotatably mounted on the drive shaft and extending laterally sprocket members, transmission connectio'nsbetween each pair of aligned sprockets, selective clutch means whereby either of said drum'shaft sprocket members may 'drive said drum, drive means whereby the drive shaft may drive the sleeve at a plurality of speeds, said drive shaft drive shaft, a drum shaft parallel to the driveshaft and having a spooling drum mounted.

sprocket independently of the drum, upon saiddrive means being rendered inoperative.

5. In a rotary drawworks, the combination of a drive shaft having a rotary machine drive sprocket mounted thereon, means to drive the thereon, a single sprocket member and a double sprocket member rotatably mounted on the shaft with the drum interposed between them, a sleeve rotatabiy mounted on the drive shaft and extending laterally beyond both ends of said drum, a pair of sprockets fixed upon said sleeve in spaced relation, one being aligned with the single sprocket member and the other being aligned with one of the sprockets on the double sprocket member, a supplementary drive sprocket rotatably mounted on the drive shaft and aligned with the other of the sprockets on the double sprocket member, transmission connections between each pair of aligned sprockets, selective clutch means whereby either of said drum shaft sprocket members may drive said drum, additional clutch means whereby the drive shaft may selectively drive either the sleeve or the supplementary drive sprocket, said drive shaft being adapted to drive the rotary machine drive sprocket independently of the drum, upon disengagement of the last mentioned clutch means.

JOHN S. MORGAN, Jl. 

